C# WinForm 实现增删改查等功能(Access版) 系列之六-分页

分页模块设计与实现

在ResumeTest主窗体中：

public int pageSize = 0; //每页显示行数
public int nMax = 0; //总记录数
public int pageCount = 0; //页数＝总记录数/每页显示行数
public int pageCurrent = 0; //当前页号
public int nCurrent = 0; //当前记录行

private void InitDataSet(DataTable _dtInfo)
{
DataTable dtInfo = new DataTable();
dtInfo = _dtInfo;
pageSize = 1; //设置页面行数
nMax = dtInfo.Rows.Count;
// MessageBox.Show("取得最大值："+nMax.ToString(),"提示");
pageCount=(nMax/pageSize); //计算出总页数
if ((nMax % pageSize) > 0) pageCount++;
pageCurrent = 1; //当前页数从1开始
nCurrent = 0; //当前记录数从0开始
LoadData();
}

//本方法来自CSDN博客，转载请标明出处：http://blog.csdn.net/gisfarmer/archive/2008/08/05/2771166.aspx
private void LoadData()
{
int nStartPos = 0; //当前页面开始记录行
int nEndPos = 0; //当前页面结束记录行
DataTable dtTemp = dtInfo.Clone(); //克隆DataTable结构框架
// DataTable dtTemp = dtInfo;
if (pageCurrent == pageCount)
nEndPos = nMax;
else
nEndPos = pageSize * pageCurrent;
nStartPos = nCurrent;
lblPageCount.Text = pageCount.ToString();
txtCurrentPage.Text = Convert.ToString(pageCurrent);
//从元数据源复制记录行
for (int i = nStartPos; i < nEndPos; i++)
{
dtTemp.ImportRow(dtInfo.Rows[i]);
nCurrent++;
}
bindingSource1.DataSource = dtTemp;
bindingNavigator1.BindingSource = bindingSource1;
dataGridView1.DataSource = bindingSource1;
}

/// <summary>
/// 分页实现
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void bindingNavigator1_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
{
//本方法来自CSDN博客，转载请标明出处：http://blog.csdn.net/gisfarmer/archive/2008/08/05/2771166.aspx

if (e.ClickedItem.Text == "关闭")
{
this.Close();
}
if (e.ClickedItem.Text == "上一页")
{
pageCurrent--;
if (pageCurrent <= 0)
{
MessageBox.Show("已经是第一页，请点击“下一页”查看！");
return;
}
else
{
nCurrent = pageSize * (pageCurrent - 1);
}
LoadData();
}
if (e.ClickedItem.Text == "下一页")
{
pageCurrent++;
if (pageCurrent > pageCount)
{
MessageBox.Show("已经是最后一页，请点击“上一页”查看！");
return;
}
else
{
nCurrent=pageSize*(pageCurrent-1);
}
LoadData();
}

}